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Julien PetitJP

Julien Petit

Fullstack Web Developer ReactJS NextJS

€350/day
Lyon, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Julien

Fullstack developer**JS** with 7 years on a B2B/B2C SaaS in production. React, Next.js, Node.js, PostgreSQL, MongoDB.

I build products end-to-end: from database schema to React component, via the API and deployment. I have a real business sense: at Mapado, I worked on complex topics such as a dynamic pricing engine, NF525 legal compliance, or analytics dashboards for professional clients.

I quickly integrate into an existing team or work autonomously on a complete feature. Clear communication, clean delivery, no need for micromanagement.

Available for one-off or long-term assignments.
  • French

    Native or bilingual

  • English

    Native or bilingual

  • Spanish

    Conversational

  • Italian

    Conversational

Can work on-site
Lyon (up to 20km)

Experience

  • Indépendant
    FullStack Developer ReactJS NextJS
    SOFTWARE PUBLISHING
    February 2026 - Today (6 months)
    Lyon, France
    Full stack sports tracking platform — architecture, development, and deployment in complete autonomy. CI/CD, self-hosted Docker infrastructure, real-time via WebSockets, natural language search by RAG vectorization, 2D mapping and heatmap, infinite scroll, automatic Strava sync.

    Self-hosted Docker/Raspberry Pi. Typescript, NextJS, NestJS, PostgreSQL, TanStack, Tailwind, RAG/RRF
    Typescript Next.js Node.js Docker
  • Mapado
    Web Developer
    SOFTWARE PUBLISHING
    June 2015 - February 2022 (6 years and 8 months)
    Lyon, France
    Team of 8 developers on a Ticketing SaaS: creation and growth to 200+ clients, 1M+ tickets/year. Typescript, ReactJS, Symfony
    Rights and roles system: management of granular permissions per organization, backoffice interface, and API endpoint security
    Analytics dashboard: revenue by channel, fill rate, geographical, demographic, temporal data, and trends
    Dynamic offers engine and creation/editing interface: automatic best price calculation, promo codes, multi-event packages
    React.js JavaScript, HTML5, CSS3, PHP, MySQL Symfony Python REST API
  • AppsPanel
    Fullstack Web Developer
    SOFTWARE PUBLISHING
    June 2014 - January 2015 (7 months)
    Lyon, France
    Development of web and mobile applications, REST webservices, and monitoring backend for large companies.
    Python JavaScript, HTML5, CSS3, PHP, MySQL REST API React.js

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Education

  • Master's degree in Computer Science Expertise
    Epitech
    2015

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